A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . sternum. It consists of two metallic bars placed at rightangles to each other; one of them, A, is placed on the vertebral column. On Bthere is placed a movable transverse bar, C, which carries on its free-end a toothedrod, Z, directed downwards. The lower end of this rod is provided with a padwhich rests on the sternum, while its toothed edge drives a small wheel which 16 242 LIMITS OF THE LUNGS. moves an index, whose excursions are indicated on a circ
A manual of human physiology, including histology and microscopical anatomy, with special reference to the requirements of practical medicine . sternum. It consists of two metallic bars placed at rightangles to each other; one of them, A, is placed on the vertebral column. On Bthere is placed a movable transverse bar, C, which carries on its free-end a toothedrod, Z, directed downwards. The lower end of this rod is provided with a padwhich rests on the sternum, while its toothed edge drives a small wheel which 16 242 LIMITS OF THE LUNGS. moves an index, whose excursions are indicated on a circle with a scale attachedto it. The Cyrtometer of Woillez is very useful. Abrass chain, composed ofmovable links, is applied ina definite direction to partof the chest-wall, , trans-versely on a level with thenipple, or vertically uponthe mammillary or axillarylines anteriorly. There arefreely movable links at twoparts which permit the chainto be easily removed, so thatas a whole it still retains itsform. The chain is laidupon a sheet of paper, anda line drawn with a pencilaround its inner margin givesthe form of the thorax ().. Fig. Thoraco-meter. Limits of the Lungs.—The extent and boundaries of the lungs areascertained in the living subject by means of Percussion, which consistsin lightly tapping the chest-wall by means of a hammer (percussion-hammer). A small ivory or bony plate (pleximeter), held in theleft-hand, is laid on the chest, and the hammer is made to strike thisplate, whereby a sound is emitted, which sound varies with the con-dition of the subjacent lung-tissue. Wherever the lung substance incontact with the chest-wall contains air, a clear resonant tone or sound—such as is obtained by striking a vessel containing air, a clearpercussion sound—is obtained. Where the lung does not contain air,a dull sound—like striking a limb—is obtained. If the parts containingair be very thin, or are only partially filled with air, the sound is mu
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectphysiology, bookyear1
